Acoustic recognition of variator slip of a continuously variable transmission
First Claim
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1. A method for detection of variator slip in a continuously variable transmission, the method comprising the steps of:
- monitoring a vibration generated by a rotation of the continuously variable transmission; and
determining a tribologic slip of the continuously variable transmission by evaluation of the monitored vibration.
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Abstract
Within the scope is a method for detecting the variator slip in continuously variable transmission (CVT transmission). The tribologic slip is detected by monitoring a rotating variator according to vibration and a subsequent evaluation.
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Citations
14 Claims
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1. A method for detection of variator slip in a continuously variable transmission, the method comprising the steps of:
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monitoring a vibration generated by a rotation of the continuously variable transmission; and
determining a tribologic slip of the continuously variable transmission by evaluation of the monitored vibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
determining an actual band frequency from a measurement of the vibrations;
determining an actual band velocity from the actual band vibration noise frequency;
determining a theoretical band velocity from a geometry of the variator and a measured rotational speed ratio between a primary side of the variator and a secondary side of the variator, and determining the tribologic slip by a comparison between the theoretical band velocity and the actual band velocity.
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8. The method according to claim 1, further comprising the steps of:
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determining an actual band frequency from vibration measurements;
determining a theoretical variator ratio from said actual band frequency;
determining an actual variator ratio from a measured rotational speed ratio between a primary side of the variator and a secondary side of the variator, and determining the tribologic slip by a comparison between the actual variator ratio and the theoretical variator ratio.
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9. The method according to claim 7, further comprising the steps of determining the tribologic slip by means of a frequency analysis, and comparing conditioned tribologically vibration features with air values stored in an electronic transmission control.
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10. The method according to claim 7, further comprising the steps of determining the tribologic slip by means of an analysis of a time domain of signals of vibration measurements, and comparing conditioned tribologically vibration features with air borne sound values stored in an electronic transmission control.
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11. The method according to claim 9, further comprising the step of carrying out a module analysis of the variator.
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12. The method according to claim 9, further comprising the step of carrying out a module analysis of adjacent parts surrounding the variator.
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13. The method according to claim 10, further comprising the step of carrying out a module analysis of the variator.
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14. The method according to claim 10, further comprising the step of carrying out a module analysis of adjacent parts surrounding the variator.
Specification